29
Service and maintenance instructions
Auxiliary hydraulics:
Pressure
is checked from the measuring
point, with full revs and by
turning the aux. hydraulics
control lever. Pressure setting
should be 240 bar.
Drive pressure:
In order to
check the pressure in the drive
circuit one needs to mount a
pressure gauge in the pressure
line in each and every case, if
pressure seems to be clearly wrong. There are two
pressure relief cartridges which have fixed 320 bar
(745), 370 bar (750) pressure setting.
It is recommended that pressures should only
be checked by a competent and experienced
technician. Call your AVANT dealer if you need
assistance.
10. Adjust pressure of hydr. system
If the pressure of hydraulic system does not seem to
be correct or pressure check indicates that the pressure
is wrong, it can be adjusted. All adjustment screws
are protected with a 13 mm nuts and there is a seal
ring under each nut. When taking off the nuts make
sure that the seal rings doesnt get lost. Adjust the
pressure with an allen key, max. 1/8 rounds at a time.
See pictures for pressure adjustment points.
Boom lifting
: Pressure is
adjusted from the pressure
relief valve at the main control
valve. Pressure adjustment
screw is on the right, on top of
the valve segment (see picture).
Adjust by turning the hexagonal
head screw which is under the
cap (240 bar).
Auxiliary hydraulics
: Pressure
is adjusted from the pressure
relief valve at the main control
valve. Pressure adjustment
screw is on the right, under the
valve segment (see picture).
Adjust by turning the screw
with a screwdriver (240 bar).
Drive pressure
: Can not be
adjusted. If the pressures are
clearly wrong one must change the pressure relief
cartridges which have 320/370 bar fixed pressure
setting.
11-13 Adjust and change the slide pads
on telescopic boom
The telescopic boom is equipped with slide pads. At
the lower end of the outer boom there are slide pads
made of nylon (nos. 1 and 2) and bronze (nos. 3 and
4). In addition, there are four slide pads (nos. 5, 6, 7
and 8), made of aluminium-bronze alloy, at the upper
end of the inner boom. All slide pads can be replaced,
and the nylon slide pads on
the outer boom can also be
adjusted. This way the
natural wear of the slide
pads, caused by the use of
the telescopic boom, can be
compensated.
Slide pads nos. 1 and 2
can be adjusted by mounting
thin adjustment sheets
between the boom and the
slide pad. Extend the
telescope almost completely
and press the boom against
the ground, it is the easiest
way to mount the
adjustment sheet under slide
pad no. 2. However, if there
is substantial wear in the
slide pads it is advisable to
replace both pad no. 1 and
2.
Slide pads nos. 3 and 4
on
the side of the outer boom
and
slide pads nos. 5, 6, 7
and 8
at the upper end of
the inner boom last very
long in normal use.
Slide pads 3, 4, 5, 6, 7 and
8 should be checked every
400 operating hours.
Checking happens by taking
the inner boom completely
out of the outer boom. If
the pads have worn so much that they are level with
the boom, change the pads.
Part nos. for the slide pads are:
Slide pad 1 and 2: A48339
Slide pad 3 and 4: A48340
Slide pad 5 and 6: A47922
Slide pad 7 and 8: A48343
Washer under slide pads 5 and 6: A47941
Adjustment sheet, short: A48013
Adjustment sheet, long: A48014
6
8
5
7
2
1
3
4
Never exceed the recommended hydraulic
pressure settings. Excessive hydraulic pressure
will damage the hydraulic pumps, cylinders,
and hydraulic motors.
Warranty does not cover damages caused by
excessive hydraulic pressure.
700 Series
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